Phosphorus-doped Isotype g-C3N4/g-C3N4: An Efficient Charge Transfer System for Photoelectrochemical Water Oxidation

Shi Fang Duan, Chun Lan Tao, Yuan Yuan Geng, Xiao Qiang Yao, Xiong Wu Kang, Jin Zhan Su, Ingrid Rodríguez-Gutiérrez, Miao Kan, Melissa Romero, Yue Sun, Yi Xin Zhao, Dong Dong Qin, Yong Yan

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Constructing isotype g-C3N4/g-C3N4 heterojunction is an approach to improve the efficiency of g-C3N4 towards solar-assisted oxidation of water. Such functional configuration can effectively overcome the intrinsic drawback of rapid charge recombination of g-C3N4. Here, a modified g-C3N4, with homogeneous phosphorus doping, is prepared in this work through a phosphide-involved gas phase reaction. The resulting P-g-C3N4 displays altered electronic structure, including upshifted band edge potential, narrowed band gap and improved electronic conductivity. These features allow P-g-C3N4 as an outstanding candidate to form isotype junction with pristine g-C3N4. As expected, the accelerated charge separation and migration in target junction is validated by various measurements. The optimized isotype g-C3N4/P-g-C3N4 heterojunction achieves a photocurrent as high as 0.3 mA cm−2 at 1.23 V vs RHE (AM 1.5G, 100 mW cm−2), representing 8-fold's enhancement compared with pristine g-C3N4. The present strategy for constructing g-C3N4-based isotype heterojunction networks is found effective for large-scale manufacturing.

Original languageEnglish (US)
Pages (from-to)729-736
Number of pages8
JournalChemCatChem
Volume11
Issue number2
DOIs
StatePublished - Jan 23 2019

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Keywords

  • charge transfer
  • g-CN
  • isotype heterojunction
  • phosphorus doping
  • photoelectrochemical

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